Stephen Harmison insisted he has no major concerns about his form heading into the Ashes series against Australia despite a faltering display in the fourth and final Test against Pakistan here at The Oval.

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England's spearhead fast bowler, who is suffering from a back injury, had a wretched day Friday but recovered Saturday to take four for 125 in 30.5 overs as Pakistan piled up 504 all out.

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However, only one of those wickets was a top-order batsman and the Durham quick's display, which featured 22.4 wicketless overs for 98 runs until Pakistan captain Inzamam-ul-Haq was caught by England skipper Andrew Strauss, added to the impression that he too often takes key wickets only when conditions are ideal and he is in peak form and rhythm.

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But Harmison, who had gone 46 overs without a Test wicket since dismissing Mohammad Yousuf for 192 in the first innings of England's 167-run series clinching third Test win at Headingley, was adamant he'd simply had an off-day.